Google started the rollout of DNS over HTTPS yesterday in Chrome Stable with the release of Chrome 83 Stable to the public.
The company calls it Secure DNS. DNS lookups are unencrypted by default; this means that DNS may be used to track the sites that an Internet user opens. Additionally, since it is unencrypted, bad actors may exploit it to manipulate or tamper with the connection, e.g. for phishing purposes.
Stress testing your computer can be a good way to check its performance under heavy load. RapydMark is benchmark tool for Windows that can help you test your PC's hardware.
The message "downloading proxy script" may be displayed by Google Chrome. If you see it frequently, you may want to know why the message is displayed by the browser and what you can do about it.
You may see the message when Internet connectivity changes, e.g. when you connect to a different Wi-Fi network or if other connectivity parameters change. Chrome may appear to take longer than usually to display sites and the downloading of the proxy script may take a few seconds to complete.